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United States Patent | 6,097,717 |
Turina ,   et al. | August 1, 2000 |
The present invention concerns a process in a radio communication system which is arranged for packet data transmission according to a message-synchronized ALOHA protocol with reservation. Mobile stations in the system are arranged to send access requests to a base station during a reservation phase in a mobile radio system which uses this protocol. The base station is arranged to receive and comply with the access request from a first mobile station by sending thereto a channel reservation message (2) comprising a channel reservation (3). The base station is further arranged to receive access requests from at least a second mobile station for which channel reservation momentarily cannot be carried out. According to the process of the invention an access request received from the second mobile station is confirmed when channel reservation cannot be carried out in the usual manner. The confirmation is sent in the form of an access confirmation (4, 5) which is included in the same channel reservation message (2) as the channel reservation (3) for the first mobile station.
Inventors: | Turina; Dalibor (Taby, SE); Billstrom; Lars (Solna, SE) |
Assignee: | Telefonaktiebolaget LM Ericsson (Stockholm, SE) |
Appl. No.: | 930039 |
Filed: | April 28, 1998 |
PCT Filed: | March 7, 1996 |
PCT NO: | PCT/SE96/00299 |
371 Date: | April 28, 1998 |
102(e) Date: | April 28, 1998 |
PCT PUB.NO.: | WO96/31077 |
PCT PUB. Date: | October 3, 1996 |
Mar 31, 1995[SE] | 9501177 |
Current U.S. Class: | 370/348; 370/443 |
Intern'l Class: | H04B 007/212 |
Field of Search: | 370/328,329,336,337,345,347,348,442,443,444,468 455/517,450,452 |
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4977589 | Dec., 1990 | Johnson et al. | |
5166929 | Nov., 1992 | Lo. | |
5515379 | May., 1996 | Crisler et al. | 370/347. |
5594738 | Jan., 1997 | Crisler et al. | 370/347. |
5790535 | Aug., 1998 | Kou | 370/337. |
Foreign Patent Documents | |||
0 491 494 | Jun., 1992 | EP. | |
5-091009 | Apr., 1993 | JP. | |
2 281 470 | Mar., 1995 | GB. | |
WO93/03583 | Feb., 1993 | WO. | |
WO94/10767 | May., 1994 | WO. |
"Medium Access Priority," Motorola, Edinburgh, Mar. 1995, pp. 1-3. |